Three people were injured in a stabbing at Tanger Outlet Mall on Saturday afternoon, and police said they had a suspect in custody.
The suspect was 15 years old, said Captain George Potts of the tribal police Mashantucket.
The three injured were taken to a local hospital, Potts said. They should survive their injuries.
The mall at Foxwoods Casino has not been closed, Potts said.
The investigation was under way.
A casinos spokesman thanked the first responders in a statement.
"Our thoughts and prayers are addressed to anyone involved in or affected by this incident," the statement said, "and we continue to work closely with the tribal police Mashantucket during this investigation."